The Hawthorne effect — people behave differently when observed — was discovered during productivity studies in the 1920s–30s.
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The Boston Molasses Flood of 1919 sent a wave of molasses through Boston streets.
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The Triassic period marked the first appearance of dinosaurs.
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The Great Fire of London began in a bakery in 1666.
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In 1908, a massive explosion flattened forests in Siberia in what is known as the Tunguska event.
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The Rosetta Stone helped scholars decode Egyptian hieroglyphs.
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In 1962, a U.S. submarine nearly launched a nuclear torpedo during the Cuban Missile Crisis.
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The 1900 Galveston hurricane remains one of the deadliest in U.S. history.
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